Sheave-block.



No. @9,4m PATENTBIJ 0613.29, 19h?.

w, H. CORBETT. SHEAVB ELOGK.

.AFLIOATIOQ FILED JULY 1, 1907.

2 Simms-3352's a.

WILLIAM HARRISON CORBETT, OF PORTLAND7` OREGON.

SHEAVE-BLOCK.

Specification of Letters Patent.

Patented Oct. 29, 1907.

Applicata.. man July 1. 1967. serai No. 381.612.

and hooks it has been customary to provide blocks with large openings and the object oi my invention is to improve theblock of that type by providing one which lwill be very strong and durable and will permit the 15 passage of the chains and hooks hunched together without danger of their catching on the block and damag' ing it. l

The invention consists generally in'various constructions and combinations, all as hereinafter described, 2C' and particularly pointed out in the claims.

In the accompanying drawings, forming part` of-this specification, Figure l is a side elevation of a sheave block embodying my invention. Fig. 2 .is a sectional view of the same. Fig. 3 is a iront viewl Fig. 4 is a side view of a cheek plate of modified construction. Fig. 5'is a sectional view of the sheave showing the modifications iii the construction of the plates. Fig. 6

is an edge view ofonefo the cheek-plates i In thedrawing, 2 represents the cheek plates having '30 bearings 3 for an axle 4 on which the sheave 5 is mounted. Brackets G depend below the periphery of the sheave 5 on` each side thereof and are connected by a bolt "7. The upper portions of the cheek plates are semi-circular in form and merge intoupwardly extending inwardly curved arms 8 which are substantially parallel with one another for a considerable distance and are connected at their upper ends by a link 9 that is detachably secured to the said arms at each end by pins 10. The arms are cored, the holes therein extend- 40 VVVing down on each side to the lower edges oi' the cheek plates, and are tubular in cross section and extend parallel with one another for a considerable distance in the planes oi' their respective cheek plates and presenta wide unobstructed passage the full width of the sheave for the chains, cables and hooks, to pass through. The outer surfaces of the arms are smooth and rounded and have no projecting edges or corners for a hook or chain to catch on. Access to the cable may be had by detaching the-link 9. The check plates and-arms are made of malleable casting which will run freely in the mold, the core holes extending through the arms and i plates as indicated in Fig. l, down on cach side of the i sheave to points onalevel substantially with the sheave pivot.

In Figs. ft, 5 and 6 1 have shown a modified construc- A55 tion which I, designate as semi-tubular, being made of teast-steel and having tubular arms corresponding to those shown in Fig. 2, but which l will designate 4by reference numeral l1, said arms being connected by the link corresponding to the one already described .60 with reference to Sheet l. The cheek pieces l2,l however, are made open on the inner side instead of having the'y cored holes in the `arms extending down on each side of the cheek plate as in the construction "shown in Fig` 1. The arms -ll have no projecting edges or corners on which a chain can catch, and the opening between the arms isvery large and will allow a bunch of chain or hooks to move rapidly through the block without being obstructed in any Way.

I claim as my invention:

1. A sheave -block comprising cheek plates. a sheave liaving beni-ings between said plates and arms tubular in cross section and having smooth exterior surfaces projecting from said cheek plates in planes substantially parallel with one another,the ends of said arms being cui-ved to- 75 ward one another, and a 'link detachably connecting said arms.

2. A shenve block comprising cheek plates. und a shcave journaled between said plates, said cheek plates being composed of malleable castings, and arms substantially tuhular in cross section extending from said plates, an opening being formed. between said arms the full width of said sheave, and said arms havingr smooth exterior surfaces to permit the passage of a chain or hooks through the block without danger of catching on said-arms, substantially as described. i

3. A sheave block comprising cheek plates, and a sheave journaled between said plates, the edges of said plates being; tubular in form and terminating on one side in tubular extensions or arms having smooth exterior surfaces whereby hooks and chains may slide through said block without catching on said plates. substantially as described.

In witness whereof, I have hereunto set my hand this 21 day of June 1907.

WILLIAM HARRSON ORBETT.

Witnesses C. E. GRELLE, H. T. HUMranEr.` 

